Robb Rynd and his brother grew up farming and wanted to do more of it outside their day jobs, so they went in together on what's now a little over 200 acres of corn, soybeans, wheat and sorghum in Paw Paw, Michigan . Last year was a good year, and Rynd said he enjoyed walking the fields with his kids to see how the corn was doing.

This year is a different story.

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All summer he's been scouting for brown and wilting leaves or ears of corn with kernels missing, and now it's becoming clear that every kernel will count this harvest. “It’s almost kind of depressing to go out there and look at it and say, ‘oh yep, it does look bad,’” he said.

Across major corn-growing states, climate change is fueling conditions that

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